Dam per-reg u lator



(No Model.)

N. F. SAW'YER, DAMPBR REGULATOR.

.X No. 434471.

Patented Aug. 19, 1890.

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uwe., wsHmofoN o c UNITED STATES .ATENT OFFICE.

NOVVELL F. SAVYER, OF HAVERHILL, MASSACHUSETTS.

DAVI PER- REG U LATO R.

SPECIFICATION forming part of Letters Patent No. 43l,471, dated August 1.9` 1890.

Application filed March 31, 1890. Serial No. 345,990. (No model.)

To aZZ whom it may concern:

Be it known that I, NowELL F. SAwYER,a citizen of the United States, and a resident of Haverhill, in the county of Essex and State of Massachusetts, have invented new and useful Improvements in Damper-Regulators, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention relates to improvements in damper-regulators for steam-boilers or hotwater generators, and it is carried out as follows, reference being had to the accompanying drawings, wherein-.

Figure l represents a front elevation of the improved damper-regulator; and Fig. 2 represents a longitudinal section on the line X X, shown in Fig. l.

Similar letters refer to similar parts wher- `ever they occur on the different parts of the drawings.

The invention vconsists of the upper and lower plates or frames A and B, preferably united together by means of stay-bolts C C C vl, as shown in the drawings.

D is a hot-water-circulating pipe, the upper end of `which is rigidly secured to the upper plate A and to an elbow E, provided with a horizontal pipe e, leading to the upper portion ot' the water-space of the boiler or hot-water generator. The lower end of the pipe D passes loosely through a perforation in the frame or plate B, and it has secured to it an elbow F, provided with a horizontal pipe f, leading to the lower portion of the steam-boiler or hotwater generator. It will thus be seen that a yproper circulation of the hot water from the boiler or hot-water generator is at all times established through the pipe DI and conduits e and f, and as the upper end of the pipe D is rigidly secured to its frame A it is free to expand downward according to the heat of the water passing through it.l

For the purpose of increasing the sensitiveness of the device I arrange within the pipe oted at B to another arm or bracket on the said frame B, as shown in Fig. 2. The said lever B .is made to rest against the under side of the elbow F, as shown in Fig. 2.

At A on a bracket on the frame or plate is pivoted a lever I, the rear end of which is connected to a rod or wire z', the other end of which is hinged to a crank 7c, secured to the damper-spindlet and damper K. (Shown 1n dotted lines in Fig. 2.)

L represents the flue leading from the furnace of the heat-generator, in which flue the damper is arranged asis common in damperregulators.

I is a balance-weight, preferably arranged in an adjustable manner on the lever I, as shown in Fig. 2. To the forward end of the lever I is secured in a suitable manner the graduated dial M, and through it passes loosely the adjustable index-carrying spindle end of the lever b acts upon a lever B', pivn, to the outer end of which is secured the v index-pointer N, as shown in the drawings. The spindle n is screw-threaded and made adjustable in a corresponding screw-threaded perforation in the forward end of the lever I, as shown in Fig. 2.. The inner end of said spindle n is adapted to bear against a kneelever O, the other end of which lies in contact with the upper end of the rod I-I, as shown in Fig. 2. The said knee-lever O is pivoted,at A to the bracket-or extension of the plate or frame A, as shown-in Fig. 2.

The dial M may be graduatedin degrees of temperature or pounds of pressure to the square inch, or otherwise, as may be desired.

By the arrangement of the pipe D, the rod I-I, and levers B b it will readily be seen that the sensitiveness of the device is materially increased, and consequently any variations in the temperature of the water circulating through the pipe D is quickly conveyed to the damper K, causing it to be gradually closed as the temperature in the boiler or heat-generator increases, and Vice versa.

In operating the device the pointer N is turned around its axis relative to the dial'M according to the maximum heat desired in the boiler or heat-generator. In the ratio as the heat of the water circulating through the pipe D increases the latter is caused to expand, and in so doing the elbowF depresses thelever B', causing the lever b to be rocked on its fulcrurn and causing the rod II to be forced upward against the knee lever O, which, bearing against the screw-threaded spindle n, secured to the lever I, causes the latter to be swung upward, and by its connection to the damper K causes the latter to be gradually closed, by which the draft through the furnace of the boiler or heat-generator is correspondingly closed for the purpose of decreasing the heat in the furnace, so as to lower the temperature of the water in the generator to the normal desired one. In case the temperature in the boiler or heat-generator should fall below the desired normal one for which the device is set, the pipe D and rod H will be contracted, causing the lever I to drop by the influence of its Weight I', and causing a corresponding opening of the damper K for the purpose of increasing the draft in the flue L, and eorrespondinginerease in the heat of the water of the generator until the normal heat is reached, and so on.

"What I wish to secure by Letters Patent, and claim` is- 1. In a damper-regulator, a circulating-pipe D, rigidly secured in one end and having its ends communicating with the upper and lower portions of a heat-generator, and having arranged within it a pipe and expansive rod H, combined with levers b B at the lower end of said rod, a pivoted and weighted lever I conneeted to the damper and carrying a graduated dial, and an adjustable index-pointer and knee-lever interposed between the spindle of said pointer and the rod H, substantially as and for the purpose set forth.

2. In a damper-regulator, an expansive circulating-pipeD,i'igidly secured in one end and having its upper and lower ends communicating with corresponding parts of a heatgenerator, and having arranged within it a guide-pipe and an expansive rod or spindle within the latter, and suitable connecting mechanism from such spindle to the damper, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence'of two subscribing witnesses, on this 22d day of March, A. D. 1890.

NOWELL F. SAIVYER.

Witnesses:

ALBAN ANDRN, M. J. JACKSON. 

